import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class Demo9 {
    public static <inputStream> void main(String[] args) {
        try(InputStream inputStream=new FileInputStream("./test.txt")) {
            while(true){
                int b=inputStream.read();
                if(b==-1){
                    break;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
